Boundary condition of grounding lines prior to collapse, Larsen-B Ice Shelf, Antarctica

M. Rebesco, E. Domack, F. Zgur, C. Lavoie, A. Leventer, Stefanie Brachfeld, V. Willmott, G. Halverson, M. Truffer, T. Scambos, J. Smith, E. Pettit

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Grounding zones, where ice sheets transition between resting on bedrock to full floatation, help regulate ice flow. Exposure of the sea floor by the 2002 Larsen-B Ice Shelf collapse allowed detailed morphologic mapping and sampling of the embayment sea floor. Marine geophysical data collected in 2006 reveal a large, arcuate, complex grounding zone sediment system at the front of Crane Fjord. Radiocarbon-constrained chronologies from marine sediment cores indicate loss of ice contact with the bed at this site about 12,000 years ago. Previous studies and morphologic mapping of the fjord suggest that the Crane Glacier grounding zone was well within the fjord before 2002 and did not retreat further until after the ice shelf collapse. This implies that the 2002 Larsen-B Ice Shelf collapse likely was a response to surface warming rather than to grounding zone instability, strengthening the idea that surface processes controlled the disintegration of the Larsen Ice Shelf.

Original languageEnglish
Pages (from-to)1354-1358
Number of pages5
JournalScience
Volume345
Issue number6202
DOIs
StatePublished - 12 Sep 2014

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Ice
Estuaries
Ice Cover
Oceans and Seas
Geologic Sediments
Chronology

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Rebesco, M., Domack, E., Zgur, F., Lavoie, C., Leventer, A., Brachfeld, S., ... Pettit, E. (2014). Boundary condition of grounding lines prior to collapse, Larsen-B Ice Shelf, Antarctica. Science, 345(6202), 1354-1358. https://doi.org/10.1126/science.1256697
Rebesco, M. ; Domack, E. ; Zgur, F. ; Lavoie, C. ; Leventer, A. ; Brachfeld, Stefanie ; Willmott, V. ; Halverson, G. ; Truffer, M. ; Scambos, T. ; Smith, J. ; Pettit, E. / Boundary condition of grounding lines prior to collapse, Larsen-B Ice Shelf, Antarctica. In: Science. 2014 ; Vol. 345, No. 6202. pp. 1354-1358.
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Rebesco, M, Domack, E, Zgur, F, Lavoie, C, Leventer, A, Brachfeld, S, Willmott, V, Halverson, G, Truffer, M, Scambos, T, Smith, J & Pettit, E 2014, 'Boundary condition of grounding lines prior to collapse, Larsen-B Ice Shelf, Antarctica', Science, vol. 345, no. 6202, pp. 1354-1358. https://doi.org/10.1126/science.1256697

Boundary condition of grounding lines prior to collapse, Larsen-B Ice Shelf, Antarctica. / Rebesco, M.; Domack, E.; Zgur, F.; Lavoie, C.; Leventer, A.; Brachfeld, Stefanie; Willmott, V.; Halverson, G.; Truffer, M.; Scambos, T.; Smith, J.; Pettit, E.

In: Science, Vol. 345, No. 6202, 12.09.2014, p. 1354-1358.

Research output: Contribution to journalArticle

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AU - Domack, E.

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AU - Brachfeld, Stefanie

AU - Willmott, V.

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AU - Smith, J.

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